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by Allan Weitz · Posted
What is a lens?
Superficially, a lens is little more than a cylinder containing optical elements that shift about as you focus by turning a ring around the cylinder. But even in its most basic form, a camera lens is far more complex than it might appear.
A lens is more than the sum of its parts. When you attach a lens to a camera, your choice of lens is very much like a painter's choice of brush. For finer details, the painter will choose a narrow, pointier brush. For cloud-free skies, a broader brush would be a wiser choice. Wide-angle lenses